<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <!-- <style>
        .one {text-decoration: underline;}
        .two {text-decoration: overline; line-height: 50px;}
        .three {text-decoration: line-through; text-indent: 10em;}
        .four {text-decoration: none; text-indent: 10px;}
    </style> -->



</head>
<body>
    <!-- <div>
        <div class="one">下划线</div>
        <div class="two">上划线</div>
        <div class="two">上划线</div>
        <div class="two">上划线</div>
        <div class="three">删除线</div>
        <div class="four">
            <a href="#" class="four">啥都没有</a>
        </div>
    </div> -->

    <!-- <style>
        body {
        background-color: #f3f3f3;
         }
        .bgc .one {
        background-color: red;
         }
        .bgc .two {
        background-color: #0f0;
         }
        .bgc .three {
        /* 背景透明 */
        background-color: transparent;
         }
       </style>
       <div class="bgc">
            <div class="one">红色背景</div>
            <div class="two">绿色背景</div>
            <div class="three">透明背景</div>
       </div> -->

    <!-- <style>
        .bgi .one {
            background-image: url("男.png");
            /* background-image: url("123.jpg"); */
            height: 1000px;
        }
    </style>

    <div class="bgi">
        <div class="one"> 背景图片 </div>
    </div> -->

    <!-- <style>
        .bgr .one {
            background-image: url(男.png);
            height: 300px;
            background-repeat: no-repeat;
        }

        .bgr .two {
            background-image: url(男.png);
            height: 300px;
            background-repeat: repeat-x;
        }

        .bgr .three {
            background-image: url(男.png);
            height: 300px;
            background-repeat: repeat-y;
        }


    </style>

    <div class="bgr">
        <div class="one">不平铺</div>
        <div class="two">水平平铺</div>
        <div class="three">垂直平铺</div>
    </div> -->

    <!-- <style>
        .bgp .one {
            background-image: url(123.jpg);
            height: 500px;
            background-color: purple;
            background-repeat: no-repeat;
            background-size: cover;
            background-position: center;
        }

    </style>

    <div class="bgp">
        <div class="one">背景居中</div>
    </div> -->

    <!-- <style>
        div {
            height: 200px;
            width: 200px;
            border: 2px solid green;
            border-radius: 150px;
        }
    </style>
    <div>有什么好说的呢</div> -->

    <!-- <style>
        .demo1 .parent {
            width: 500px;
            height: 500px;
            background-color: green;
        }

        .demo1 .child {
            background-color: red;
        }
    </style>

    <div class="demo1">
        <div class="parent">
            <div class="child">child1</div>
            <div class="child">child2</div>
        </div>
    </div> -->

    <!-- <style>
        .demo2 span {
            width: 500px;
            height: 500px;
            background-color: red;
            /* padding: 100px; */
            margin: 100px;
            border: 2px solid dashed;
            border-style: dotted;
            border-color: green;
        }

    </style>

    <div class="demo2">
        <span>child1</span>
        <span>child2</span>
        <span>child3</span>
    </div> -->

    <style>
        div {
            /* width: 100%;
            height: 150px;
            background-color: red;
            display: flex;
            justify-content: space-around; */
            
            width: 500px;
            height: 500px;
            background-color: green;
            display: flex;
            justify-content: stretch;
            align-items: center;
        }

        div span {
            width: 50px;
            height: 100px;
            background-color: red;

            /* width: 100px;
            height: 100px;
            background: green; */
        }

    </style>

    <div>
        <span>1</span>
        <span>2</span>
        <span>3</span>
        <span>4</span>
        <span>5</span>
       </div>


</body>
</html>
